The mans name from Sierra is Rich Machholz.
The 338 UM isn't a bad choice for a sporter weigh rifle for long range shooting. The case has the capacity and the Sendero type rifles (aluminum bedding block and HS stock) with a 26" barrel have a good reputation for accuracy. And that 26" barrel will help, though it would be nice to have a couple extra inches hanging out there IMO. But for a poor mans LR rifle I say you could do much worse!
Recoil will be rather stiff wiothout a brake on it, and much tougher to spot your own impacts also. just a suggestion for your consideration.
Also in reference to my comments above about the bullets hogging up case capacity. I see your comments on never seeing a short throat. If you've never seen or loaded these 300gr bullets you'll know what I talking about when you see them. These bullets are as long as a 223 Rem case to give you a comparison. I've never seen a factory throat long enough to seat these bullet into the lands and not have the bullet sticking way down in the case. Remember factory gun throats are cut for the max. length of the magazines not the longest bullets made for that caliber. Not arguing only raising the safety flag and saying just be careful when loading and have fun!
Your bit and on your way....... have fun with your magnum! with or without the "itus" to go with it. Who cares? shooting is shooting period.
I took a more in depth look at the ballistics involved and here are my thoughts.
The .338 Win mag, not being a HUGE case may not be the best vehicle for launching the big 300gr Sierra's. Lapua sells a 250gr bullet with a BC of .675. The lighter bullet will give me more case capacity as well as being easier to drive to faster velocities. This should translate into a loss of downrange energy but a gain in downrange velocity and a flatter trajectory. At 1900yds the 250gr bullet would still strike with more than 600 ft/lbs of energy.
The Lapua bullets also have an excellent reputation for accuracy.
Another conversation on this board brought up the fact that loads of deer are killed with .357 Mag revolvers which have a damn sight less impact energy than a 250gr .338 bullet.
The only downside to the Lapua bullets is they only come in boxes of 100 and they are a bit more expensive than the Sierra's. So if I decide to go this route I have at least 100 punishing shots to make out of an unbraked, lightweight .338 Win Mag. My shoulder hurts just thinking about it. [img]images/icons/frown.gif[/img]
Sierra now has a 250 .338" Match King. The BC is
.587 @ 2150+
.606 @ 2150-1700
.576 @ 1700-1400
.484 @ <1400
Load from a Disk says that in a 26" tube pushing the 300gr MK in a 338win the MV will be in the 23-2500 fps range. The 250 will be in the 25-2600 fps range.
If the Lapua 250gr got your attention on price, have you looked at the 300s? Sierra only sells them bulk in boxes of 500. The cheapest I've ever seen them is for approx $180 bucks. that is expensive in US dollars let alone the exchange rate for Canada.
But as pointed out above Sierra also makes a 250gr MK as of this Jan/Feb time frame. If you use the Lapua bullets they tend to run a little bigger at the pressure ring so you'll get more pressure with them then other bullet brands.